A message body writer for Java type class myPackage B and MIME media type application octet-stream was not found

Question

I am new at RESTful webservices and was trying to update my  OneToMany relationship from a standalone client application  but I am not able to do that  I am using the Jersey implementation of JAX-RS that ships with Glassfish 3 1 1   I have a class A that has a  OneToMany relationship with class B    MyRestClient is my standalone client that is calling my RESTful webservice which has been deployed on Glassfish 3 1 1     MyRestClient java  public class MyRestClient       public static void main String   args                Client client   Client create                    WebResource resource   client resource  http   localhost 8080 myapp rest a update 123                B b1   new B  debris                 ClientResponse response   resource put ClientResponse class  b1           System out println response getEntity A class  getTitle       has     response getEntity A class  getBList   size       Bs               AResource is an EJB session bean which I am using as RESTful webservice   AResource java   Stateless  Path   a   public class AResource         EJB     private AManager aManager        PUT      Consumes MediaType APPLICATION XML       Produces MediaType APPLICATION XML       Path   update  id        public Response updateA B b   PathParam  id   int id            A a   aManager findAById id           a addB b           return Response status Status OK  entity a  build              When I run the client I get the following error message  com sun jersey api client ClientHandlerException  A message body writer for Java type  class myPackage B  and MIME media type  application octet-stream  was not found   Following are the domain objects in my standalone client application which is making a call to the AResource EJB session bean which I am using as the RESTful webservice   A java   XmlRootElement public class A implements Serializable        private List lt B gt  bList   new ArrayList lt B gt         public List lt B gt  getBList             return bList              remaining code      B java  public class B implements Serializable        private String text      private A a             XmlTransient     public A getA             return a             public void afterUnmarshal Unmarshaller u  Object parent            this a    A  parent              remaining code      Could someone help me understand why this is happening and how I should solve this problem

User · Answer

This also happens if you re missing an empty public constructor for the Entity  could be for JSON  XML etc

User · Answer

Make sure that all these libs are in your class path   compile group   com sun jersey   name   jersey-core          version   1 19 4    compile group   com sun jersey   name   jersey-server        version   1 19 4    compile group   com sun jersey   name   jersey-servlet       version   1 19 4   compile group   com sun jersey   name   jersey-json          version   1 19 4   compile group   com sun jersey   name   jersey-client        version   1 19 4   compile group   javax ws rs   name   jsr311-api   version   1 1 1   compile group   org codehaus jackson   name   jackson-core-asl   version   1 9 2   compile group   org codehaus jackson   name   jackson-mapper-asl   version   1 9 2   compile group   org codehaus jackson   name   jackson-core-asl     version   1 9 2   compile group   org codehaus jackson   name   jackson-jaxrs        version   1 9 2   compile group   org codehaus jackson   name   jackson-xc           version   1 9 2     Add  Pojo Mapping  and  Jackson Provider  to the jersey client config   ClientConfig clientConfig   new DefaultClientConfig    clientConfig getFeatures   put JSONConfiguration FEATURE POJO MAPPING  Boolean TRUE   clientConfig getClasses   add JacksonJsonProvider class     This solve to me   ClientResponse response   null   response   webResource          type MediaType APPLICATION JSON           accept MediaType APPLICATION JSON           get ClientResponse class     if  response getStatus      Response Status OK getStatusCode           MyClass myclass   response getEntity MyClass class       System out println myclass

User · Answer

In your client code you are not specifying the content type of the data you are sending - so Jersey is not able to locate the right MessageBodyWritter to serialize the b1 object   Modify the last line of your main method as follows   ClientResponse response   resource type MediaType APPLICATION XML  put ClientResponse class  b1     And add  XmlRootElement annotation to class B on both the server as well as the client sides

User · Answer

Include this dependencies in your POM xml and run Maven -  Update   lt dependency gt       lt groupId gt com sun jersey lt  groupId gt       lt artifactId gt jersey-json lt  artifactId gt       lt version gt 1 18 1 lt  version gt   lt  dependency gt   lt dependency gt      lt groupId gt com owlike lt  groupId gt      lt artifactId gt genson lt  artifactId gt      lt version gt 0 99 lt  version gt   lt  dependency gt

User · Answer

You need to specify the  Provider that  Produces MediaType APPLICATION XML  from B class  An add the package of your MessageBodyWriter lt B class gt  to your  WEB INF web xml as     lt init-param gt   lt param-name gt com sun jersey config property packages lt  param-name gt   lt param-value gt  your providers package  lt  param-value gt   lt  init-param gt

User · Answer

i was facing the same problem for a get method i was returning an  int  for the  get method Strangely when i change the return type to String the error was gone Give it a try and if someone knows the logic behind it kindly share it

User · Answer

This can also happen if you ve recently upgraded Ant  I was using Ant 1 8 4 on a project  and upgraded Ant to 1 9 4  and started to get this error when building a fat jar using Ant   The solution for me was to downgrade back to Ant 1 8 4 for the command line and Eclipse using the process detailed here

User · Answer

This solved my issue   http   www markhneedham com blog 2012 11 28 jersey-com-sun-jersey-api-client-clienthandlerexception-a-message-body-reader-for-java-class-and-mime-media-type-applicationjson-was-not-found   Including following dependencies in your POM xml and run Maven -  Update also fixed my issue    lt dependency gt       lt groupId gt com sun jersey lt  groupId gt       lt artifactId gt jersey-json lt  artifactId gt       lt version gt 1 19 1 lt  version gt   lt  dependency gt   lt dependency gt      lt groupId gt com owlike lt  groupId gt      lt artifactId gt genson lt  artifactId gt      lt version gt 0 99 lt  version gt   lt  dependency gt

User · Answer

You have to do two things to remove this error    The  xmlElement mapping in the model The client side   response   resource type MediaType APPLICATION XML  put ClientResponse class  b1     consume  or  response   resource accept MediaType APPLICATION XML  put ClientResponse class  b1     produce

User · Answer

Adding reference to    lt dependency gt       lt groupId gt com sun jersey lt  groupId gt       lt artifactId gt jersey-json lt  artifactId gt       lt version gt   jersey1 version  lt  version gt   lt  dependency gt    As long as adding clientConfig getFeatures   put JSONConfiguration FEATURE POJO MAPPING  true   on client creation solved the issue for me   ClientConfig clientConfig   new DefaultClientConfig    clientConfig getFeatures   put JSONConfiguration FEATURE POJO MAPPING  true   Client client   Client create clientConfig

[web-services] A message body writer for Java type, class myPackage.B, and MIME media type, application/octet-stream, was not found

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